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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
.selected{
background: rgb(133, 34, 34);
}
</style>
</head>
<body>
<div onclick="setSelectedRange()" class="container">
<span>获取<span class="selected">鼠标</span>选中<span class="selected">文字的</span>的</span><br />
<span>获取鼠标选中文字的的</span><br />
<span>获取鼠标选中文字的的</span><br />
<span>获取鼠标选中文字的的</span><br />
<span>获取鼠标选中文字的的</span><br />
<span>获取鼠标选中文字的的</span>
</div>
<script>
function setSelectedRange(e) {
var el = document.body.querySelectorAll('.container')[0]
let start;
let end;
if (window.getSelection) {
const range = window.getSelection().getRangeAt(0);
console.log('range',range);
const preSelectionRange = range.cloneRange();
console.log('preSelectionRange 1 ',preSelectionRange);
preSelectionRange.selectNodeContents(el);
console.log('preSelectionRange 2 ',preSelectionRange);
preSelectionRange.setEnd(range.startContainer, range.startOffset);
console.log('preSelectionRange 3 ',preSelectionRange);
console.log('preSelectionRange 4 ',preSelectionRange.toString());
start = preSelectionRange.toString().replace(/\s/gm,'').length;
console.log('preSelectionRange 5 ',start);
end = start + range.toString().length;
console.log('preSelectionRange 6 ',end);
} else if (document.selection && document.selection.type !== 'Control') {
const selectedTextRange = document.selection.createRange();
const preSelectionTextRange = document.body.createTextRange();
preSelectionTextRange.moveToElementText(el);
preSelectionTextRange.setEndPoint('EndToStart', selectedTextRange);
start = preSelectionTextRange.text.length;
end = start + selectedTextRange.text.length;
}
console.log('setSelectedRange - [获取鼠标选中文字的 index] :', start, end);
}
</script>
</body>
</html>
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